Lock PHPUnit version until bug fix

https://jira.mongodb.org/browse/PHPC-2456

Author: GromNaN

composer.json

@@ -21,7 +21,7 @@
     },
     "require-dev": {
         "doctrine/coding-standard": "^12.0",
-        "phpunit/phpunit": "^10.5",
+        "phpunit/phpunit": "10.5.3",
         "rector/rector": "^1.2",
         "squizlabs/php_codesniffer": "^3.7",
         "vimeo/psalm": "^5.13"